JPS61144336A - Manufacture of coil-reinforced hose and manufacturing device thereof - Google Patents

Abstract

PURPOSE:To enable to mold and hold and inside and outside shape of an end face of the title hose into round without making a twist generate on the hose, by a method wherein an inner tube in a molten state is inserted into a coil member, both are pulled together, the inner tube is made to swell by feeding air within the same and they are made to unify by adhering the inner tube closely to the coil member. CONSTITUTION:Warp 4 is provided along a shaft center direction by an extru sion molding machine A and a molten state inner tube 1 on the external circum ferential surface of which adhesive layer is laminated for unification is extruded. In a coil molding machine B, a reinforcing wire 2' makes revolution of a coil in a radial direction come to a standstill through action of a coil molding part, which is sent out in a thrustward direction at equal interval pitches in order by preventing back spring by making permanent strain generate on the coil, the inner tube 2 is inserted into a coil member 2 and they are unified by adher ing the same to the coil member 2 by swelling action based on air, which is supplied to an extrusion molding machine E through action of a take-off machine C, outside of which is coated with an outer tube 3 for lamination.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a coil-reinforced hose in which a coil body made of metal, synthetic resin, or a combination of both is wound and integrated on the outside or inside the intermediate layer of the hose. The present invention relates to a manufacturing method and apparatus.

(Prior art) Today, various types of lightweight and flexible synthetic resin hoses have been developed in contrast to conventional rubber hoses. In particular, lightweight and flexible hoses are made by wrapping thin walls with coils to reinforce them. ing.

This coil-reinforced hose is generally manufactured by extrusion-molding and then wrapping a reinforcing wire around the outer circumferential surface of the hardened hose using a coil-forming machine. As such, a certain degree of wall thickness was required.

Moreover, in the above method, since the reinforcing wire is wound around the outer circumference of the hose, the resulting coil-reinforced hose is twisted in the winding direction of the reinforcing wire, and when fluid or gas is passed through the hose, the hose becomes twisted, making it difficult to work. It has such defects.

In addition, since the reinforcing wire is directly wound around the hose, the hose is extruded from the extruder and then passed through a water tank to cool and harden.The hose must be fixed in shape before it can be used with a coil winding device (coil forming). Therefore, when forming a hose and continuously wrapping it with reinforcing wire, the hose (tube) extruded from the extrusion molding machine is passed through a cooling device such as a water tank and hardened to maintain its shape. After stabilizing the coil winding device (
There are disadvantages such as the hose manufacturing line becomes long because the hose is fed into a coil forming machine) and the installation space for the equipment becomes large.

Therefore, an invention as shown in Japanese Patent Publication No. 56-36050 has been proposed to solve the above-mentioned problems.

In the manufacturing method shown in this invention, a reinforcing member is wound multiple times on a guide means provided along the outside of a pressurized hose core to form a continuous winding portion, and the reinforcing member is wound intermittently in the direction of transport of the hose core. The applied pressure presses the actual last row of windings of the reinforcing member on the guide means and transfers the actual first row of windings of the reinforcing member on the guide means onto the hose core. .

However, in the manufacturing method of the invention described above, when the molten hose core extruded from the extrusion molding machine is inserted into the cylindrical pre-rolling sleeve of the guide means, it comes into contact with the inner surface of the pre-rolling sleeve and the extrusion occurs. Since the molded hose core is deformed and damaged, it is impossible to supply the molten hose core extruded from the extruder as it is.

In addition, the reinforcing member transferred onto the hose core cannot completely remove stress because the reinforcing member having elasticity is wound around the guide means (pre-winding sleeve) to form a coil shape. It has the disadvantage that the coil pitch and coil diameter become unstable and uneven because the coil that is tightly wound on the device is pushed forward and released. Furthermore, since the reinforcing member is wound around the guide means and formed into a coil shape, stress remains in the reinforcing member, and when the hose is cut, the end of the reinforcing member will be pushed outward by the elastic force caused by the stress. As a result, the end surface of the hose is no longer a perfect circle, and when the hose is fitted into a hose connection fitting, a gap is created between the hose and the fitting.

(Problems to be Solved by the Invention) In view of the above-mentioned circumstances, the present invention has been devised as a manufacturing method in which a coil body can be integrally wound around a molten tube extruded from an extrusion molding machine, and which does not cause twisting of the hose. and equipment.

(Means for Solving the Problems) The technical means of the present invention for solving the above problems is to curl the reinforcing wire to a desired coil diameter to cause permanent deformation, and to stop the rotation in the radial direction. A molten inner tube extruded from an extruder is inserted into a coil body that is sent out sequentially at equal pitches in the thrust direction, and the inner tube is pulled together with the coil body, and air is sent into the inner tube to The method is to bulge the inner tube and bring the outer peripheral surface of the inner tube into close contact with the coil body, and a device that makes this method possible is between an extrusion molding machine for the inner tube and a cooling means for cooling the inner tube. First, the wire length per revolution required for coil forming is drawn out from the drum around which the reinforcing wire is wound, and fed into the roll die, and the coil forming section is rotated in the opposite direction to the wire introduction direction to form the coil. A coil forming machine with a bending mechanism that stops rotation in the radial direction and curls the wire between the feed roll and roll die to cause permanent deformation and prevent back spring is installed, and the molten inner tube is coiled. It is now inserted into the molding machine. Incidentally, an extrusion molding machine for the outer tube, a vacuum pump, etc. can be attached to the above technical means depending on the cross-sectional structure of the hose to be molded.

(Function) The molten inner tube is inserted into the stationary coil body which is curled to a diameter equal to the coil diameter by the bending mechanism, causing permanent deformation and preventing back spring, and is swollen by the blown air. Since the hose is closely integrated with the coil body, no twisting occurs in the hose, and the coil body is formed without any relation to the inner tube, with stress removed and permanent deformation remaining, which prevents back springs and reduces pitch. The diameter of the coil is also stable, and the inner and outer shapes of the hose end face can be formed and maintained in a perfect circle.

Further, it is possible to freely add to the above method a step of covering the outer tube, reinforcing the warp along the axis of the inner tube, etc. as appropriate.

(Example) Hereinafter, an example of the present invention will be described based on the drawings for a type that covers seven outer tubes.

1 and 2 schematically show the apparatus of the present invention, A is an extrusion molding machine for the inner tube 1, and the inner tube 1 is placed in front of the extrusion direction of the inner tube 11 extruded from the extrusion molding machine A. A coil forming machine B that forms the coil body 2 to be wound on the outside, a hot air machine C21, an extrusion molding machine E that extrudes and molds the outer tube 3, a cooling water tank F, a take-up machine G, and a product winding machine H. They are arranged sequentially in a straight line. Of course, the extrusion molding machine A that extrudes and molds the inner tube 1 may be used to extrude the tube 1 alone, but in order to increase the strength of the molded hose as shown in the figure, a plurality of warp threads 4 are inserted along the axis on the outer circumferential surface of the inner tube 1. It is equipped with an attached warp yarn unwinding device I, and an inner tube 1.
An extruder J for adhesive layer is connected to increase the adhesive strength of the coil body 2 and the outer tube 3 wound around the outer circumferential surface of the coil body 2, and an inner tube with a two-layer structure with the warp threads 4 inserted in the middle is extruded. It is also possible to do so.

In addition, an air blowing device K is connected to the extrusion molding machine A, which blows air into the molten inner tube 1 to form a circular shape. This is to ensure that the changes are made.

In the coil forming machine B, a fixed guide tube 7 is held horizontally by a bearing 6 fixed upright on a pedestal 5, and a rotary frame 8 is attached to the outside of the fixed guide tube 7 via a bearing 9 so as to be freely rotatable. A drum 10 having a reinforcing wire 2' wound thereon is freely rotatably attached to the outside of the rotating frame 8, and a coil that rotates integrally with the rotating frame 8 is attached to the outside of one side of the fixed guide cylinder 7. The rotary frame 8 has a molded part 11, and the rotary frame 8 is driven and rotated by the rotation of a motor 12 installed on a pedestal 5 through belt transmission.

The coil forming part 11 that rotates together with the rotating frame 8 is
It is arranged in a mounting tube 13 fixedly protruding from one side of the rotating frame 8, and its coil forming portion 11 has a wire length per revolution (L=Vtedo)2+endmare required for coil forming. 7. P: Pitch width of the coil, πD2 Circumferential length of the feed roll 14 that is pulled out from the drum 10, and the linear reinforcing wire 2' fed by the feed roll 14 are made equal to the diameter of the coil.

It is composed of a bending roller 15 that curls to a large diameter and causes permanent distortion to prevent back spring, and a roll die 16 that keeps the curled reinforcing wire 2' stationary in the radial direction and sequentially feeds it out at equal pitches in the thrust direction. has been done.

Before the feed roll 14 that pulls out the wire length per rotation required for coil forming from the drum 10, about one and a half turns of the reinforcing wire 2' are wound in order to prevent the reinforcing wire 2' from slipping and to ensure that it can be drawn out reliably. A guide pipe 18 is installed between the bending roller 15 and the feed roll 14 to linearly guide the reinforcing wire 2'.
is provided. The roll die 16 coils the curled reinforcing wire 2', keeps the radial direction stationary, and sequentially sends it out at equal pitches in the thrust direction, and annular grooves 19 are cut out at predetermined pitches on the outer peripheral surface of the roll. At the same time, the annular grooves 19 in each roll are formed with phases so as to form a coil shape, so that the reinforcing wire 2' curled by the bending roller 15 is inscribed in the roll die 16 while forming an annular l! 19, and the coil body 2 is formed. Here, the reason why the coil is molded while being stationary in the radial direction is that the coil forming part 11 is rotated in the opposite direction to the introduction direction of the reinforcing wire 2', and the length of the reinforcing wire is required to rotate and move the coil forming part 11. This is done by drawing out and supplying from the drum 10.

Further, the feed roll 14 that constitutes the coil forming section 11.
Bending roller 15. The rotation of the roll die 16 is
A gear train 27 of a rotating member supported by a shaft in a mounting tube 13 that rotates driven by a fixed gear 2o fixed to a fixed guide tube 7.
This is done by combining various meshes.

Furthermore, the reinforcing wire 2'' wound around the drum 10 is attached to the mounting tube 1.
The coil is guided into the coil forming part 11 through a guide ring 22 for direction change attached to the outer peripheral surface of the coil 3 via a support 21 and a through hole 23 formed in the mounting tube 13.

Furthermore, although it is of course possible to use only one coil forming machine B, it is preferable to move the coil forming machine B onto the rail 24 so that it can be replaced immediately when the remaining amount of the reinforcing wire 2' wound around the drum becomes low. It can also be placed freely.

In front of the coil forming machine B, there is a drive roller 25 that is approximately drum-shaped.
A hot air machine is installed in front of the drawing machine C, and the inner tube 1 and the coil body 2 wound on the outside are heated by passing through the hot air machine. As a result, the surface is melted and softened, and the outer tube 3 in the next step is tightly integrated with the inner tube 1 and the coil body 2.

The extrusion molding machine E for the outer tube 3 covers the coil body 2 wound around the inner tube 1.
The form of the coating may be simply placed on the coil body 2, or it may be a structure in which the outer tube 3 is coated under a vacuum condition and tightly joined to the inner tube 1 and the coil body 2. be. In the latter case, a vacuum pump 26 is connected to the extrusion molding machine E, and the extrusion mold is also designed for vacuum use. The cooling water tank F, take-up 11G, and product winding machine H after the extrusion molding machine E of the outer tube 3 are of a structure generally employed in today's hose manufacturing.

The above is a manufacturing device for a hose in which seven outer tubes 3 are coated and laminated on the outside of an inner tube 1 and a coil body 2. However, in the case of a hose that does not require an outer tube 3, a pulling machine C and an extrusion molding for the outer tube 3 are used. 11E is removed, and the inner tube 1 wrapped with the coil body 2 is introduced into the cooling water tank F. In the figure, reference numeral 29 is a brake roller that prevents the drum from rotating excessively and the wire rod 2' from becoming loose when the coil forming machine is started or stopped.

Next, to explain the process from extrusion molding of the inner tube 1 to completion of the coil-reinforced hose, first, the warp threads 4 are attached in the axial direction by extrusion molding 11A, and an adhesive layer is laminated and integrated on the outer peripheral surface. The inner tube 1 in this state is extruded, expanded into a circular cross section by air supplied into the inner tube 1, and supplied to a coil forming machine B.

In the coil forming 11B, the reinforcing wire 2' is sequentially fed out in the thrust direction at equal pitches by stopping the rotation of the coil in the radial direction by the action of the coil forming part 11, causing permanent strain and preventing back spring. The inner tube 1 is inserted into the coil body 2, tightly integrated with the coil body 2 by the expansion action of air, and is supplied to the extrusion molding machine E of the outer tube 3 by the action of the take-up machine C. The outer tube 3 is coated and laminated on the outside of the inner tube 1 and the coil body 2 by the extrusion molding machine E, and the product passes through a cooling water tank F to harden, and the product with a stable shape is wound up by the action of the take-up IIG! It will be wound up in 1H.

The reinforcing wire 2' formed into the coil body 2 in the coil forming 81B may be a steel wire coated with a synthetic resin film, a single steel wire, a hard synthetic resin wire, or a combination thereof, and the bending roller 15 Any wire that can be permanently deformed by the action of can be used.

Further, the coil diameter and pitch of the coil body 2 formed by coil forming JIB can be changed by changing the arrangement diameter of the roll die 16 and the interval between the annular grooves 19 cut in the roll die 16.

It should be noted that the present invention is not limited to the embodiments described above, but can of course be applied and modified in various ways without departing from the gist of the present invention.

(Effects of the Invention) The method for manufacturing a coil-reinforced hose of the present invention is to insert a molten inner tube into a coil body which is sequentially fed out at equal pitches in the thrust direction after stopping the radial rotation of the coil and applying permanent strain. The inner tube and the coil body are pulled together and air is blown into the inner tube to cause it to swell, and the outer peripheral surface of the inner tube is tightly integrated with the coil body. has advantages.

■ The molten inner tube extruded from the extrusion molding machine can be directly introduced into the coil molding machine and wound with a coil body, making it possible to shorten the production line. That is, in the invention of Japanese Patent Publication No. 56-36050, in order to pass the hose core through the guide means, the shape of the hose core must be hardened and stabilized before it can be introduced into the coil winding process. If the core is passed through the guide means in a molten state, it will come into contact with the inner surface of the guide means, and the hose core will be damaged, making it impossible to manufacture a coil-reinforced hose.

■ The coil body wrapped around the outside of the inner tube is
The coil forming part is rotated in the opposite direction to the reinforcing wire introduction direction to stop the radial rotation of the coil, and the bending row is used to curl the coil to a diameter equal to the coil diameter to impart permanent strain and prevent back spring. Since the coil body is rolled up and sent out sequentially at equal pitches in the thrust direction, the pitch and coil diameter of the coil body wound on the inner tube are very stable, making it possible to manufacture a hose with stable quality.

■ The coil body is permanently strained to prevent back springs, so there is no twisting in the finished hose with the coil body wrapped and integrated, and the end of the coil body does not spring back at the cut end of the hose. Therefore, the inner and outer shapes of the end surfaces of the hose always maintain a perfect circle state, and the connection to the hose connection fittings etc. can be made tightly.

■ Because the inner tube is expanded and crimped and integrated with the coil body, the inner tube returns to its original shape between the pitches of the coil body due to cooling, resulting in slack between the pitches. The flexibility of the hose is very good.

Furthermore, in the apparatus for carrying out the above method, the inner tube is introduced into a coil forming machine in a molten state and wound, so that the production line can be shortened, and
It is possible to efficiently and continuously manufacture hoses of stable quality.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view showing an outline of the production line, FIG. 2 is a front view of the same, FIG. 5 is a left side view of the same section, FIG. 6 is a plan view of the same section with a section cut away, FIG. 7 is an enlarged side view showing the forming section side of the coil forming machine, and FIG.
The figure is a longitudinal side view of the same, and FIG. 9 is an enlarged sectional view of the inner tube around which the coil is wound. In the figure, A: Inner tube extrusion molding machine B: Coil forming machine 1: Inner tube 2: Coil body 2': Reinforcement wire 7: Fixed guide cylinder - 8 = Rotating frame 10 Ni drum 11: Coil forming section 15: Pending 0 -516:
roll dice

Claims (4)

[Claims] (1) A molten inner tube extruded from an extrusion molding machine is inserted into a coil body in which the wire rod is coiled with its rotational direction stationary and sequentially moved in the transport direction of the inner tube, and the inner tube is turned into a coil body. At the same time as pulling at the same speed as the moving speed of the inner tube, air is sent into the inner tube to swell the tube, and the outer circumferential surface of the inner tube is tightly integrated with the coil body. A method for producing a coil-reinforced hose, which comprises forming an outer tube on the outside using an extrusion molding machine. (2) In front of the inner tube extrusion molding machine with an air blowing device connected to the piping so that air can be blown into the inner tube, a rotary frame is attached to the outside of the fixed guide tube so as to be freely driven and rotatable. A drum on which the material is wound is mounted so as to be freely rotatable, and a roll die and a wire supply means are provided outside one side of the guide cylinder and have a bending part that rotates integrally with the rotating frame, and the roll die has a wire supply means. manufactures a coil-reinforced hose in which a coil-forming machine that can be driven and rotated freely in the winding direction of the forming coil, which is opposite to the rotation direction of the rotary frame, allows the coil body to be wound without pressurizing the inner tube. Device. (3) The coil-reinforced hose manufacturing apparatus according to claim 2, wherein the inner tube extrusion molding machine is equipped with a warp feeding device for attaching warp threads along the outer surface of the inner tube. (4) Coil reinforcement according to claim 2 or 3, wherein two of the coil forming machines are movably mounted on a rail laid in a direction perpendicular to the extrusion direction of the inner tube and can be switched freely. Hose manufacturing equipment.